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21597 (1998 WA8)
Classification: Main-belt Asteroid          SPK-ID: 2021597
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07423561989786438 7.1101e-08  
a 3.017975302259597 4.5451e-08 AU
q 2.793934034859911 2.0693e-07 AU
i 11.25770721493397 9.7663e-06 deg
node 60.0896337055562 4.4628e-05 deg
peri 231.6332773989145 9.6148e-05 deg
M 105.2655790316614 8.2098e-05 deg
tp 2456240.541512368652
(2012-Nov-09.04151237)
0.00044038 JED
period 1915.01398084414
5.24
4.3261e-05
1.184e-07
d
yr
n .1879881836900802 4.2467e-09 deg/d
Q 3.242016569659283 4.8825e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      826  
   data-arc span      6442 days (17.64 yr)  
   first obs. used      1996-05-16  
   last obs. used      2014-01-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50851  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-09 23:02:23  

Additional Information
 Earth MOID = 1.7933 AU 
 T_jup = 3.214 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.2 mag n/a MPO266069  

21597 (1998 WA8)          Discovered 1998-Nov-18 by Ueda, S., Kaneda, H. at Kushiro (399)
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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